Home / Standards / GB/T 20490-2023 GB/T 20490-2023 Active Non-destructive testing (NDT) methods of steel tubes—Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections 钢管无损检测 无缝和焊接钢管分层缺欠的自动超声检测 Standard Type GBT ICS 77.040.20 CCS H26 Status 现行 Issue Date 2023-08-06 Implementation 2024-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A